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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6919e33b7024f2786193052fec9e917e184a05fa6806b38e3e501f178dbb1780' 
  AND token = 'rqYN5zmMRq6y7I0tpYeE08lbvLkoPcITaNxUv6j4e1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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