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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3645a69795e9f01d1859feee050035ff302a1c334ffd8f21b6aa243b485c28e3' 
  AND token = 'l0RDIIT0z3y6ASYm/v8TAykO+7saS/u1BHshvVl9DtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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