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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e24763f05c63f9877981dcae32d1424b617883697db925e9fcd076d90e1cf064' 
  AND token = '/Q+qDtty61lL2fLln2ZZ6lDbaVaXxXGkzsz6y2ySP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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