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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2cb6d334685f91f8e7bb7817ee4c28d45328b345416ac39b6cbac4c62117a07' 
  AND token = 'LBnLsWNJcyN/BgN4sTnb7XFBI+gbe+w576AYuvjB9HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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