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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb6f98f3febff6074687953740c9d324a0938cdbc0dd4ef75153e48bd4857578' 
  AND token = 'XBtVn5na+rpd6kUE2+OW1MGyXRfbLhGeg0wM2PRW5+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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