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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a26a25a0290e3f03e41b80cfc385a4105f55ddef2779cb0bdec667dc99cffae9' 
  AND token = 'cs6PbiTIN/wKe9u6Z4sciBSoNwFKE/sef1SCsStN9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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