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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '695adf5faa4a63ab588866a8f679e05edcd8c34d4cd5483898e43283d2044528' 
  AND token = '6COxwvkOH0yOQ8PJ3Lus7FtB4T354HkSk1+e2bwQdqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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