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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd970f1f833f5caf3089e2557cee982640ef4846ac322c016e622091fc5f7735a' 
  AND token = 'kXCdcpzZ7QTqHPk5964L5Ib17EUTalTy/J1Nbltb3m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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