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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60edb102b774c6ad7c70c2aba377fc643585b3571bba677d5e3f3197eeb9142b' 
  AND token = 'a7PBgSnNp1PeF1tvwGwA6di5hiPuRSUtr1FA+vXUTSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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