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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7af5d9cd06868ba37643495357f6e9a7e8d643a15dcc11c5e5313c6ee08fb341' 
  AND token = 'rQUJw5Xxl1UGDLMmDT5b+9kx0jHXbI260DwuVcSK4Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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