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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '61e125f9faab4ae48f383a76590583c4858a2b4f7620b13b7e64e6818c2b1d1c' 
  AND token = '+dwchZIpIlxHt0fGeXNIcB8vtD79lQsObznFxks4+QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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