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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1fc226ac7c45b68163a98bd4da01adc6e9d0064ccfb7d18e692f1b0fb52912e1' 
  AND token = '2Pjz40d7fCA6mhVAOUmZUq/9O6QydP2ft/czHq3n9Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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