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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a0ee54e4467b87e38736c605176c0ef0760457d356eaa41cbc543ef6c9031b6' 
  AND token = 'GSlcsPsSeq7Xs4CehdNwY49/CAkh13sodKFOxlCg+tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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