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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a8d2ee4218427fd5ff51ecbecbb32f05f4e3c96c8434cb66495f8aec3118ee4' 
  AND token = 'cMu5YePBLQmpU7mapWqXshFEB9+9dkTjPmzI5yWzlMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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