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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f576259b63bb27a9a1cf0287f112fb97e8d8d7ec1186bbb2899edb1925a9e131' 
  AND token = 'qix1nW18oct7IKCN6bw51NxZv7iBLhKAdSJQeRuBPGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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