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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a25b0f145c4c889ca4f0b563b516f67d52ae324d6c3c1bd514b156bd214caab' 
  AND token = 'OVfWFiNQbOLVLcv3+kxVc5UUeWKF7UbrF+IL26VBxdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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