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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '987eb22108e9d3255e4be68fe957dc7dff7e0ff75463c354689a2aa64912f20c' 
  AND token = 'VHZnV49W6Hi81qbp/R1tJ7heLIXj/BebeaqBcfVh734=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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