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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '026ff610fbf03817878a158a29d9f3af0757939e1766732f443d09b66653c59b' 
  AND token = '2azYf2abiZj5xZ4RH6oES5n0qV/ibDoeR+ZYSyYtt98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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