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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e31f03f7912ecf4b885ff3a765a7100c13a327db9c3bdcb32b0e95f5bf5e7dbf' 
  AND token = 'at3nZpxfCnNW5zkcFvYyy1yVeTLpCYncVXelaUfLAA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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