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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b1b8dfa5def586a182621edf919ebca4e2bf9c38dbb8b304e82b9a32ace0bf4e' 
  AND token = 'pqeMYjwtNIsU4mkpRMn2R4L753CK4gSppRVpz5BWAv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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