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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7cd98d3e18fdeae71cbf107259211df0d6fec7603f51d8798719d9a8c1f700a' 
  AND token = 'QX/6xGlGJyt56hsn2jBqlmJG1mYQd/3af2t/QoIx5f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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