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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd315eb92cd28cc3ca24393c3adadb8a5b005c1c642fee54003ab867dafcfc0a2' 
  AND token = 'SFT9+bxYAqg8NECcmPmpPiUbTuziiwbD9wDLW0hY06g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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