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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2589e5dc19fa9748b27e18b6f3f6839fc668c58d0abdf547f83fbbcbe2141e9a' 
  AND token = '5V+1Pv6r7vNexjEJ9Ex+mSenEBZ22Kd7R2qXJ8rIMLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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