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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0301ecd2745fb9c1536f4b3dfaec796b6dc2043e87953aa6c1e11d43cbb7ceaa' 
  AND token = '+yS1jf/G7s77tEjahX0HEE5x3+BScuGyQ9PxYxav0Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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