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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fef456bc139e75ce061e49b2eff4e1f825b641e953b44796eb07bd3ae07406f7' 
  AND token = '4mj4xXk99QmZhwrEQhjcMGx6xxNOP9k6vGOsOAyzVk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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