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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b069e570f06ec14176d06aabe5ca3c7df45998b5e63da432cb67c574ddf37cc' 
  AND token = 'fd6uroxnYlqxyOGMp/K/b1Jd0U8tdjkB2m9gmly10Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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