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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f05421b8051a4c81bc8eba93bd54912580ed8c5f7c73d4632f1ec84ce6c8f8b' 
  AND token = 'uQy+Q/LVZNE2nCmFkpC5m9gk+ryNsJr3rkeFor/LC2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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