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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '48c0cfbfdf693725957d83c733a9c0e599d8fb69374dd790ba0d0b99b434d3c7' 
  AND token = 'sxi8HOrnXTdcj6jSIt+oUb7fqp55HYQA7iBey4VruRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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