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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd0ff326f450374bab4f103b1af139c2f70cf6e92c6bbab1adb4f6cfcb53af1dc' 
  AND token = 'MpmAEjsxHOEhtp2xZ2Swm/SkGFaBY2+ATffzuJHQ1lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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