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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8c6cdb7a15eaa2da96c88fee96f9540655e67c7e12cbbae05e87ba2f88c52afd' 
  AND token = 'YHZ3MlUhhU4yu6RQ7plkRZNNUUvXo4YxIIIk3P6w208=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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