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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8946d568b7c338728642d9c47b33fa8afa5a0d7bc2cb90a855a70cb0ba758c21' 
  AND token = 'd9kjAkngBewsDYho2/SamsmibmTQoIOyfOABIsGOtSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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