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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d6a63c641e8384e5a11bb4006df32477260f9451c55cc448a79c1f6b24fbe1a' 
  AND token = 'SwSSYARZhPNJXOzMsOYmQ9Vio+wu4atbk60pxAE6+8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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