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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f176ab768bef7b434df87bd72302debea39c1306b8bab373eaf3bb5b19d6c4f2' 
  AND token = '42thpMO59GzF1W2J2qtE0slbLHj+AbBjeaWJWj5pRyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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