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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c5c1314afae3c6e45998b991e9d0c4d04a7a70ade9c5db894fce9e17fdc50ae' 
  AND token = '5eh1NXtBBJjhD1eYMHe8yuucwpRgmI72W3jy7KMa+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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