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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30e209076e3246575e0e5f052e221b5349ff5bdd4eeedfddd7e8033caa01fb49' 
  AND token = 'PErMI8oDb1jbyHSB2f1UuHxVEbIJ9F0xBfBGwhLYJkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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