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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c2a712fe426d1725464fac652b6a72c3a6982f298d84bbf681f2d351e1a0ea6' 
  AND token = 'O+1lhQ6o+cjFEwlfi5tQ/8AJAo4Gvbv5x2+oyNPoAcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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