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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '733bfa0b223d15a842ef5e55f6adcc5fc2b8bfb47c68002de22192cf27d79854' 
  AND token = 'rYDtJ4b+eD2oTt7vqVJ6lm7ob+gp+PQLKQN2oBJ7dNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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