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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5e6760d188c2c5a2dbce6e6577e1ff766dc4fa9de0e855d124cbea2899e9a255' 
  AND token = 'v0Z4vN1t1XLwdaYQbBxTtHzpfa9fJwtP557r1TFGKmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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