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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f60e5c2cd36850b1bd5c9c27bcc17a3bc8e4eb3371c30266ce6c74ac2456ceb' 
  AND token = 'MhKsCBcYj3Q8+4FIOe5qNXK1ZzqZ4x6j495s/370JR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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