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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '473e159a753f6cebbeae2a6197f748efc251b4ba631dc3a8b77b4e911b20d45b' 
  AND token = '8mpeeauGd1ZjZHYaCgJXhA0u0jV9Numr86kgRkpobvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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