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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3b9e61ed07bbbd352241fc365935e73a4c3a9836d149c2b3f27be7b33bd8bed' 
  AND token = '1ru19MxCJtoPAtCM1yMiivnGtNhxKKjwAsvmdHpi9zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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