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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '439c457d477722f51afb10ec4f8b97824f22cc34993b605aba2c0d2372eecfe1' 
  AND token = 'Bosi76mq1ul37UzVpzsetEvq8Gk0xSNj9bNOVQ6vovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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