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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd7d1212398a04f51a1582f30d26ecc4614f9c9175e28a3392b668e1cd85abbb' 
  AND token = 'GtI+wn7FK+nX0VU4FxX5mGQ7UoY5dhoQnr1Ehi0OW9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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