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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b6c882886f3927080be50adbdcc25ca0cdad07050957dc14cec0c36b0d70bf1' 
  AND token = 'CGBbpQj76TEiGhm3Kid/vMLTVZciR8AOMRh1i3kCmW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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