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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e7a1f8e2921d5d296d7198f1c8c245acbfe1b8d4804ffafa82e2fdec1d44098' 
  AND token = 'EATNX+ZPRCovgEVI8I0MjrltTFyAxAPX7oQeEx7HNL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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