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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0626bc26e60e5e58886fca0aadaeaabad34b18ae562b4c789b40a929f52e2efa' 
  AND token = 'noc9aPE0ms4yScaZ78us7T1f/+jY05UgOIIbMRiwbjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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