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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '87f9731f4211ab1914c9e04bc68988b7fdc67d13bc33e53a111215431ce29730' 
  AND token = 'JnmbjLXni0y4g/ho9hG1SyE6bLlCmYDbGvmLdgmws5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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