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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '768a8a0ed93d048f575c0ecad857019f8a6bec4682d7e104276f3955abad4b21' 
  AND token = '93QSueS551d/i1ZHujaL2k0vQNe8467dM6y3R5wBLZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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