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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c2b0b8df4d662d4e15446c5d6c81a1b1576f14c5642c437ebe30485d6179858' 
  AND token = 'igBXcgpxQpInO71QHOljv09oLG0zduo1ICYgzlEbc1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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