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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5599e1d7fbb9e3ff0d100a2d1deeb3d80e266c6432a0974f86630d14579b92c7' 
  AND token = 'OyqI14YqNgfpTYec7g3QD60sBPepBbQ0Im/6hHaMps0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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