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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a0e03e193aa8a709668b4637744aef34f98bd08bbe77e55017e67628219e6eb9' 
  AND token = 'bKPAiqiaEP6Tm6pNpIhzfOsVl/uqIpOp/FUYfwJlLPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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