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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1370260ba3a7dddbd803681acc57915da742bdae9dc399e8488df7fe062cdcfe' 
  AND token = 'L1twe7YxUf4Pr8i+m7x8vXYSPtHnPZIqtnIOtZnug6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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