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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6737708c16e00bebb3b85fb83777ae8cb4f40c9deaee5d7af8daefa409d549fb' 
  AND token = 'pyJH8uZfFA1TzBr37YnXobK3FOkJRNQJ5J2Fw1oziPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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