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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b351136068e53feffaed6b1770466a45c156b008d6fbd5a43bfee5cb12761323' 
  AND token = '7I/1YzWwZM+Q88w4FM0iki16inneHoNsjOFf8tHQvR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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