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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7777762c3620f2926bb905b335d2d3fd2f42ec6187c58e43dc7b1f9ee9cc3b8c' 
  AND token = '+tsCP+W5rO4/o6lV9T65ppuAz3zAYVSDlSq7ynrxE80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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