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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f1701010034bb931a78562d5e6219fe23dd84bb51c80dabee68b6d915a239d0f' 
  AND token = '1vDbD5SmmGpDD05Ukr3t0mnN3SYji7ZCDypw2QhLFGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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