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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfe7c3cf89b3f87e4ff60bda8e3775eaf1ccca40a9d91b42f2d79f8f33613163' 
  AND token = 'Lz0iMwlUlPQbzHDruvwafwW4ilu3oA5dZI8ya/y3P+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}