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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1ddf8d0a8a9301db8754abbc0b1ba0aba880f59032f3ac26f155ee9799994f6' 
  AND token = '2DTE93Z9Ssagi1dFypuTjW0iIxygEvufa68TUcz3Wjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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