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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '231a7d87c0453e490afcdad0bb89bef01f05290c132065d35e29475114b276d3' 
  AND token = '/bt266BEceL5kl77b3YHH/tj0HqFw+zCAdwc+18ZC1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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