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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c367bb5644d6c6f21c1ac5131e777772d7ef4509654bf2c1a22cd47569ed2fd' 
  AND token = 'oNVg+yDOI4JV+vQesemebpHsWa5mME+A5TumaYY2A8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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